Beckham was probably driving a BMW High Security X5 armored vehicle.

I have no idea if it comes with some type of passive remote entry/start system, but it makes sense in a vehicle modified for security. Who wants to be fumbling around with a key to start up a vehicle when the bad guys are coming after you?

Do the "smart keys" and "comfort access" systems use the same 40 bit rolling security codes used in your garden variety remote entry systems and garage door openers?

My understanding was that it was impossible for a normal PC to generate 40 bit security codes and that it would take something more like a Cray super computer. BTW - if they didn't build enough security into the newer system, then shame on them.